c++ program to check whether a given number is a perfect number or not

Write a c++ program to check whether a given number is a perfect number or not.

Flowchart of perfect number program

C++ Source code of the perfect number

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
	int i,mid,num,sum=0;
	cout<<"enter the num";
	cin>>num;
	mid=num/2;
	i=1;
	do
	{
		if(num%i==0)
		sum=sum+i;
		i++;
		}
      while(i<=mid);
	  if(sum==num)
	  {
	  	cout<<num<<"is a perfect number";
	  }
	  else
	  {
	  	cout<<num<<"is not a perfect num";
	  }
	  getch();
}

#include<iostream>

#include<conio.h>

using namespace std;

int main()

{

int i,mid,num,sum=0;

cout<<"enter the num";

cin>>num;

mid=num/2;

i=1;

{

if(num%i==0)

sum=sum+i;

i++;

}

while(i<=mid);

if(sum==num)

{

cout<<num<<"is a perfect number";

}

else

{

cout<<num<<"is not a perfect num";

}

getch();

}

Output enter the num 5 5 is a perfect number

Excercise

Find the possible mistakes in the following Shamil’s Flow Table of the program to check whether a given number is a perfect number or not.

*loop*	*Line which executed*	*Actual work to do*
*I=1*	*1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,* *13, 14, 25, 16*	*N%i==0* *6%1==0* *Sum=sum+i* *Sum=0+1=1*
*I=2*	*1, 2, 3, 4, 5, 6, 7, 8, 9, 10,* *11, 12, 13, 14, 25,16,17,* *11,12,13,14,25,16,*	*N%i==0* *6%2==0* *Sum=sum+i* *Sum=1+2=3*
*I=3*	*1, 2, 3, 4, 5, 6, 7, 8, 9, 10,* *11, 12, 13, 14, 25,16,17,* *11,12,13,14,25,* *16,17,11,12,13,14,25,16,*	*N%i==0* *6%3==0* *Sum=sum+i* *Sum=3+3=6*
*I=4*	*1, 2, 3, 4, 5, 6, 7, 8, 9, 10,* *11, 12, 13, 14, 25,16,17,* *11,12,13,14,25,* *16,17,11,12,13,14,25,16,17,18*
	*1, 2, 3, 4, 5, 6, 7, 8, 9, 10,* *11, 12, 13, 14, 25,16,17,11,* *12,13,14,25,* *16,17,11,12,13,14,25,16,17,* *18,19,20,21,26,27*	*Sum=6* *Is a perfect number*

c++ program to check whether a given number is a perfect number or not
By: Prof. Dr. Fazal Rehman | Last updated: October 21, 2023

Flowchart of perfect number program

C++ Source code of the perfect number

Excercise

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